Meta Software Developer interview questions

I did two phone interviews and then was flew in for an onsite.

The interview consisted of two parts. The first part was a basic screening my the HR person through a set of e-mail questions regarding preferences of work, technology experience, etc. The second part consisted of a phone conversation with one of the the Facebook engineers where he asked questions regarding current employment responsibilities, why the interest in Facebook, etc. He then proceeded to ask a simple technical question which you had to provide a solution for on the spot through a web application from which he could see you typing (a bit nerve wrecking).